C-05-Q091mediumsingle_mcq
According to the 20-20 rule recommended in the chapter, while using a monitor one should —
According to the 20-20 rule recommended in the chapter, while using a monitor one should —
- aLook away for 20 minutes every 20 seconds
- bLook away for 20 seconds every 20 minutes
- cSleep for 20 minutes every 20 hours
- dBlink 20 times every 20 minutes